Global systems

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Across
  1. 4. debris made and exposed by melting glaciers
  2. 5. period of cold average surface temperature of the Earth
  3. 8. periods of warming and cooling on Earth
  4. 9. where living things use food to release energy
  5. 12. all the water on Earth
  6. 14. type of gas that traps heat on Earth
  7. 15. type of ocean current pushed by the wind on top of the water
  8. 16. element involved in making proteins such as during composting
Down
  1. 1. circulation also known as the global conveyor belt
  2. 2. all of the Earth's land and where we live
  3. 3. type of ocean current that sinks to the bottom of the ocean and is very salty and cold
  4. 6. made up of all the air and gases on Earth
  5. 7. frozen rivers of ice
  6. 10. a liquid and cycle that is constantly recycling water on Earth
  7. 11. an element and cycle that all living things need to survive
  8. 13. where plants turn carbon dioxide into food